stm1403ctoq6f STMicroelectronics, stm1403ctoq6f Datasheet - Page 17

• Manufacturer Part Number: stm1403ctoq6f
• Description: 3v Fips-140 Security Supervisor With Battery Switchover
• Manufacturer: STMicroelectronics

Tamper detection
Physical
Supply voltage
Note:
There are four (4) high-impedance physical tamper detect input pins, 2 normally set to High
(NH) and 2 normally set to Low (NL). Each input is designed with a glitch immunity (see
Table 7 on page
devices (e.g., switches, wire mesh). A tamper on any one of the four inputs that causes its
state to change will trigger the security alarm (SAL) and drive it to active-low. Once the
tamper condition no longer exists, the SAL will return to its normal High state.
TP
switch or a high-impedance resistor to V
of STM1403B/C), A tamper condition will be detected when the input pin is pulled low (see
Figure 5
TP
impedance resistor or a closed switch to V
input pin is pulled high (see
The internally switched supply voltage, V
monitored. If V
should go below the under voltage trip point, V
active-low. Once the tamper condition no longer exists, the SAL pin will return to its normal
High state.
When no tamper condition exists, SAL is normally High (see
page
When a tamper is detected, the SAL is activated (driven low), independent of the part type.
V
used (see
●
●
●
The STM1403 must be initially powered above V
For example, if the battery is on while V
V
on battery or V
its operational state.
OUT
CC
1
2
and TP
and TP
ON;
High-Z; or
Ground (V
rises above V
11).
can be driven to one of three states, depending on which variant of STM1403 is being
and
Table 1: Device options on page
3
4
are set Normally to High (NH). They are connected externally through a closed
Figure
are set Normally to Low (NL). They are connected externally through a high-
INT
CC
SS
29). These inputs can be connected externally to several types of actuator
. This is done to avoid false alarms when the device goes from no power to
).
should exceed the over voltage trip point, V
RST
6). If not used, tie the pin to V
(and t
Figure 7
rec
expires). From this point on, alarms can be detected either
and
CC
OUT
INT
Figure
SS
= 0V, no alarm condition can be detected until
1):
(in the case of STM1403A) or V
(either V
. A tamper condition will be detected when the
LV
RST
8). If not used, tie the pin to V
(set at 2.0v, typical). SAL will be driven
OUT
to enable the tamper detection alarms.
CC
or V
input or V
TPU
Section : Pin descriptions on
HV
.
(set at 4.2V, typical), or
BAT
input) is continuously
TPU
SS
(in the case
.
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